fortran debugger 1

[fortrannewcomer2005]

I am trying to modify a fortran program (3500 lines of code). I never programmed in fortran before, and I don't know whether there is a debugger like visual c++. There aren't many comments, or design documents to help understand the code. Would you recommend a fortran debugger?

Thanks,

 

[zeitghost]

What machine & op sys do you run the code on?

Codeview was supplied with the MS FORTRAN compiler.

 

[fortrannewcomer2005]

zeitghost, thank you very much for replying to m yquestions. I run it on linux cluster (red hat). It can also be run in window, I will check out codeview.

I have another question on random number generator. Do you know any fortran 77 code that can generate real random numbers? The one in the program I am working on generate only pseudo random number, and every time I run it, it gives me the same series of numbers.

 

[zeitghost]

I don't think Codeview will run under Linux, that I may be wrong. It's an antique dos program...

Generating really random numbers is difficult... theses have been written on it... can't help you there, sorry.

 

[ArkM]

There are lots of freeware pseudo-random numbers generators in INet. See, for example (or try your own search):

http://www.fortran.com/fortran/random1.f90

Common way to go (to generate different series): seed your generator with time/date values (it depends on generator used, see link above). In practice no such animal as real random number on deterministic computers. Moreover, you can't debug non-trivial algs with real random behaviour...
See also your compiler docs (search RAND function with its SEED companion).

 

[xwb]

On Linux, compile with -g and debug with gdb (GNU version of dbx). There is also a windowed version but I can't remember what it is called. Something like xxgdb but I'm not sure.